pjsip_session.c

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/*
 * Asterisk -- An open source telephony toolkit.
 *
 * Copyright (C) 2017, CFWare, LLC
 *
 * Corey Farrell <[email protected]>
 *
 * See http://www.asterisk.org for more information about
 * the Asterisk project. Please do not directly contact
 * any of the maintainers of this project for assistance;
 * the project provides a web site, mailing lists and IRC
 * channels for your use.
 *
 * This program is free software, distributed under the terms of
 * the GNU General Public License Version 2. See the LICENSE file
 * at the top of the source tree.
 */

#include "asterisk.h"

#include <pjsip.h>
#include <pjsip_ua.h>
#include <pjlib.h>

#include "asterisk/res_pjsip.h"
#include "asterisk/res_pjsip_session.h"
#include "include/res_pjsip_private.h"
#include "asterisk/linkedlists.h"
#include "asterisk/lock.h"
#include "asterisk/module.h"


AST_RWLIST_HEAD_STATIC(session_supplements, ast_sip_session_supplement);

void ast_sip_session_register_supplement_with_module(struct ast_module *module, struct ast_sip_session_supplement *supplement)
{
   struct ast_sip_session_supplement *iter;
   int inserted = 0;
   SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);

   ast_assert(supplement != NULL);

   supplement->module = module;

   if (!supplement->response_priority) {
      supplement->response_priority = AST_SIP_SESSION_BEFORE_MEDIA;
   }

   AST_RWLIST_TRAVERSE_SAFE_BEGIN(&session_supplements, iter, next) {
      if (iter->priority > supplement->priority) {
         AST_RWLIST_INSERT_BEFORE_CURRENT(supplement, next);
         inserted = 1;
         break;
      }
   }
   AST_RWLIST_TRAVERSE_SAFE_END;

   if (!inserted) {
      AST_RWLIST_INSERT_TAIL(&session_supplements, supplement, next);
   }
}

void ast_sip_session_unregister_supplement(struct ast_sip_session_supplement *supplement)
{
   struct ast_sip_session_supplement *iter;
   SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_WRLOCK, AST_RWLIST_UNLOCK);

   AST_RWLIST_TRAVERSE_SAFE_BEGIN(&session_supplements, iter, next) {
      if (supplement == iter) {
         AST_RWLIST_REMOVE_CURRENT(next);
         break;
      }
   }
   AST_RWLIST_TRAVERSE_SAFE_END;
}

static struct ast_sip_session_supplement *supplement_dup(const struct ast_sip_session_supplement *src)
{
   struct ast_sip_session_supplement *dst = ast_calloc(1, sizeof(*dst));

   if (!dst) {
      return NULL;
   }
   /* Will need to revisit if shallow copy becomes an issue */
   *dst = *src;

   return dst;
}

int ast_sip_session_add_supplements(struct ast_sip_session *session)
{
   struct ast_sip_session_supplement *iter;
   SCOPED_LOCK(lock, &session_supplements, AST_RWLIST_RDLOCK, AST_RWLIST_UNLOCK);

   AST_RWLIST_TRAVERSE(&session_supplements, iter, next) {
      struct ast_sip_session_supplement *copy = supplement_dup(iter);

      if (!copy) {
         return -1;
      }

      /* referenced session created. increasing module reference. */
      ast_module_ref(copy->module);

      AST_LIST_INSERT_TAIL(&session->supplements, copy, next);
   }

   return 0;
}

void ast_sip_session_remove_supplements(struct ast_sip_session *session)
{
   struct ast_sip_session_supplement *iter;

   if (!session) {
      return;
   }

   /* free the supplements */
   while ((iter = AST_LIST_REMOVE_HEAD(&session->supplements, next))) {
      if (iter->module) {
         /* referenced session closed. decreasing modue reference. */
         ast_module_unref(iter->module);
      }

      ast_free(iter);
   }

   return;
}